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Document-Oriented Storage

NoSQL databases often store data in flexible, semi-structured documents (e.g., JSON) rather than rigid tables.
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The statement of the theorem

Let D\mathcal{D} be the set of documents. A document d∈Dd \in \mathcal{D} is modeled as a recursive structure, d≡Map(K,V)d \equiv \text{Map}(K, V), where KK is the set of keys and VV is the value type. The value type VV can be an atomic element (e.g., R,S\mathbb{R}, \mathbb{S}) or a nested document, V∈DV \in \mathcal{D}. Formally, dd can be represented as a set of pairs (ki,vi)(k_i, v_i), where viv_i itself adheres to the structure vi≡Map(K′,V′)v_i \equiv \text{Map}(K', V'). This allows for arbitrary nesting and heterogeneous data types within a single record.
Source: Wikipedia